Topology Seminar
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Mon, 18/01/2010 15:45 |
Professor Graem Segal (Oxford) |
Topology Seminar  |
L3 |
| Physical space-time is a manifold with a Lorentzianmetric, but the more mathematical treatments of the theory usually prefer toreplace the metric with a positive - i.e. Riemannian - one. The passage fromLorentzian to Riemannian metrics is called 'Wick rotation'. In my talk I shallgive a precise description of what is involved, and shall explain some of itsimplications for physics. | |||
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Mon, 25/01/2010 15:45 |
Andrzej Zuk (Paris) |
Topology Seminar |
L3 |
| TBA | |||
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Mon, 01/02/2010 15:45 |
Vlad Markovic (Warwick) |
Topology Seminar |
L3 |
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Mon, 08/02/2010 15:45 |
Victor Schroeder (Zurich) |
Topology Seminar |
L3 |
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Mon, 15/02/2010 15:45 |
Jeff Giansiracusa (Swansea and Oxford) |
Topology Seminar |
L3 |
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Mon, 22/02/2010 15:45 |
Pierre-Emmanuel Caprace, Bruxelles (Bruxelles) |
Topology Seminar |
L3 |
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Mon, 01/03/2010 15:45 |
Ralph Cohen (Stanford and Copenhagen) |
Topology Seminar |
L3 |
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Mon, 08/03/2010 15:45 |
Fred Cohen (Rochester) |
Topology Seminar |
L3 |
| The subject of this talk is the structure of the space of homomorphisms from a free abelian group to a Lie group G as well as quotients spaces given by the associated space of representations. These spaces of representations admit the structure of a simplicial space at the heart of the work here. Features of geometric realizations will be developed. What is the fundamental group or the first homology group of the associated space in case G is a finite, discrete group ? This deceptively elementary question as well as more global information given in this talk is based on joint work with A. Adem, E. Torres, and J. Gomez. | |||
